So I bought a 1988 Ford F150, It's the Straight 6, and has been converted to a 4 speed. The other day I was driving and it stalled on me, would crank, but not start. I'm not a mechanic, and don't have a TON of experience, but I have tooled around with cars a bit, so I thought it could've been a fuel pump issue. I had it towed home, and decided to check the Fuel Filter first, because I had a spare on hand, and the fuel was clean looking and flowing fine. I looked under the hood at some of the wiring, and the Fuel pump relay, and the pigtail it was plugged into had some loose wires, so I rewired a new pigtail, and replaced the relay. With the filter off, I turned the key, and gas did pump out of the line, so I would assume the fuel pump is kicking on and working. My next thought was maybe I wasn't getting ignition, so I threw some gas down the throttle body, and sure enough, she fired right up, but died when that gas was gone. This leads me to believe there is either a clog in fuel line between the filter or an issue with the injectors. I could be wrong, but all 6 injectors wouldn't fail at the same time, so could it be a computer issue? I haven't done a pressure test at the fuel rail yet, but when I get a chance to, I'll post results on here. Any help would be greatly appreciated!

 

Fuel pressure should be 50-60psi KOEO. Pull the vacuum hose off the fuel regulator to see if fuel comes out of it if so it's bad.
Also see if you have power at the injectors as the computer only supplies the ground to them as a trigger.

 

Check fuel pressure as posted above.

Immediately, read this thread and follow the instructions to pull codes.

https://www.f150forum.com/f10/how-re...es-obdi-10907/

This will help save you from throwing random parts at it in the hopes of making it work!

My next test would be a voltage test of the TPS (throttle position sensor) which runs EVERYTHING else! If it is bad you will not get an injection pulse! I have learned from my 90 300 I6 that there is not always a code for the TPS!! Use a 5.00 digital voltmeter anxd check the voltage manually. the instructions are in the Haynes book.

 

X2 on pulling codes. Do that first. Then check the fuel emergency shut off behind the kick panel.

 

On an 88 the Inertia switch is on the drivers side inside firewall, in front and outboard of the clutch pedal.

Seems to me if the inertia was tripped the pumps shouldn't run at all. I think the pressure is the place to go and make sure there is enough. The 6s need more then the 8s and if enough psi isn't there, its not going to run.

 

I think you are correct on that. Just a random thought. Thanks for the followup.

 

Codes, codes, codes! Trying to second guess an OBD1 cpu is worse than figuring out what you did to **** your wife off (or what she thinks she found out about!)

LOL